EXX.com exchange have $98,921,809 USD (13,371 BTC) trading volume. I think they are legit. But don't be fooled by the huge difference in margin, the 121 USD showing may only be a sell order made by someone. It does not necessarily mean you can sell at 121 USD
Judging if exchange is legit or not by trading volume is not the best idea. Its cummon knowledge that most of crypto exchange (even from top 10 coinmarketcap) are trading with themselve to boost trading volume (free advertisement) or are letting users pump trading volume by token mining while trading - what is nothing more than paying users to pump trading volume paying them in token that they generated for free as much they need.
With 100 mln trading volume there should not be 10% spread on litecoin (buy/sell) so price difference should give good return while arbitraging. If noone is doing that it means that something stinks.
I think it might be exit scam. I heard lots of issues with this exchange beafore.